This is a petition by the appellants in the case of Anarews v. Hovey, reported in 123 U. S. 267, ante, 101, for a rehearing of that case upon the points upon which the decision was based. The suit was a suit in equity, brought by the appellants for the infringement of reissued letters patent No. 4372, granted to Nelson W. Green, one of the appellants, May 9, 1871, for an 'improvement in the method of constructing artesian wells,' the original patent, No. 73,425, having been granted to said Green, as inventor, January 14, 1868, on an application filed March 17, 1866. The circuit court had dismissed the bill on the ground of the invalidity of the patent. The plaintiffs appealed, and this court affirmed the decree. In its opinion, it was said: 'The patent is familiarly known as the 'Driven Well' patent. The specifications and drawings of the original and reissued patents are set forth in the opinion of this court in Eames v. Andrews, [122 U. S. 40, 7 Sup. Ct. Rep. 1073.] Numerous defenses are set up in the answer in the present case, and voluminous proofs have been taken in respect to those defenses; but it is necessary to consider only one of them, which in our view is fatal to the validity of the patent, and that is, that the invention was used in public, at Cortland, in the state of New York, by others than Green, more than two years before the application for the patent. The brief of the appellants concedes that it is shown in this case that other persons than Green put the invention into public use more than two years before his application was filed. It is contended for the appllants that this was done without his knowledge, consent, or allowance. The appellee contends that such knowledge, consent, or allowance was not necessary in order to invalidate the patent, while the appellants contend that it was necessary. The whole question depends upon the proper construction of section 7 of the act of March 3, 1839, (5 St. 354,) interpreted in connection with sections 6, 7, and 15 of the act of July 4, 1836, (5 St. 119, 123.)' 123 U.S. 269, ante, 102. Our decision was that the patent was invalid, because the invention covered by it had been in public use more than two years before Green applied for the patent, without reference to the question whether he consented to such use or not. The views which led to this conclusion were set forth at length in the opinion, and a further consideration of them, in the light of the arguments presented on this application for a rehearing, has only served to confirm us in the conviction that they were correct. But, as the briefs of counsel in support of the application proceed upon the ground that certain views and authorities, which they think bear upon the question involved, were not presented to us upon the original hearing, we deem it proper to state the reasons for our adherence to our conclusion.

2

The main proposition urged by the counsel for the appellants is, that the question involved was adjudged by this court in accordance with their views, in the case of Kendall v. Winso , 21 How. 322, decided in 1858. In the same connection, other authorities, which, it is alleged, were not cited by counsel on the former hearing, are presented. It is also urged, that the court omitted to give due weight to what is said to be the current of executive and judicial authority in favor of the construction upon which the appellants rely; and that the seventh section of the act of 1839 does not apply to the patent in question, because it is a patent for a process. The question involved arises upon the second clause of section 7 of the act of 1839, which section was in these words: 'That every person or corporation who has or shall have purchased or constructed any newly-invented machine, manufacture, or composition of matter, prior to the application of the inventor or discoverer for a patent, shall be held to possess the right to use, and vend to others to be used, the specific machine, manufacture, or composition of matter so made or purchased, without liability therefor to the inventor, or any other person interested in such invention; and no patent shall be held to be invalid by reason of such purchase, sale, or use prior to the application for a patent as aforesaid, except on proof of abandonment of such invention to the public; or that such purchase, sale, or prior use has been for more than two years prior to such application for a patent.' This section contains two clauses, all that precedes the first semicolon being the first clause, and all that comes after the first semicolon being the second clause. The first clause relates to the right of a person, as against a suit by the patentee for infringement, to use and sell the specific machine, manufacture, or composition of matter purchased or constructed prior to the application for the patent, and the use of which would otherwise be a violation of the patent. The second clause relates to the effect upon the validity of the patent, of such purchase, sale, or use prior to the application. The questions involved in the two clauses are quite different. The first clause relates to the particular right of a particular defendant to use a particular machine, manufacture, or composition of matter after the grant of the patent, and notwithstanding its grant, and in no manner relates to the validity or invalidity of the patent. The second clause relates wholly to the validity of the patent. Most of the authorities laid before us and relied upon on the present application relate entirely to the first clause of the section.

3

The first case in which the seventh section of the act of 1839 appears to have come under consideration in this court was that of McClurg v. Kingsland, 1 How. 202, decided in 1843. But that was a case which involved only the first clause of the section. The patent was for an improvement in the mode of casting chilled rollers. It was, therefore, a patent for an improvement in a process. The patentee invented it while he was a workman in the employ of the defendants. The put it into use in their business. He left their employment, and then applied for and obtained his patent. His assignees sued the defendants in an action at law for continuing to use the improvement. There was a verdict for the defendants, upon the ground that, by reason of their unmolested, notorious use of the invention before the application for the patent, they had a right to continue to use it, under the provisions of the first clause of the seventh section. The judgment for the defendants was affirmed by this court upon that ground. It held that the defendants were on the same footing as if they had had from the inventor a special license to use his invention, given before he applied for his patent, and that the first clause of the seventh section extended to the invention or thing patented in that case, although it consisted of a new mode of operating an old machine, as contradistinguished from a patent for a machine. The court distinctly held that the words 'newly-invented machine, manufacture, or composition of atter,' and the words 'such invention,' in the first clause of the seventh section, meant the invention patented; and that the words 'the specific machine, manufacture, or composition of matter' meant the thing invented, the right to which was secured by the patent. We see nothing in this case which sustains the position of the appellants.

4

The first reported case in a circuit court, involving any part of the seventh section, is that of Pierson v. Screw Co., 3 Story, 402, in 1844, in the circuit court for the district of Massachusetts, before Mr. Justice STORY. That was a case which involved only the first clause of the section. The defendant had, prior to the patentee's application for his patent, purchased the right to use a certain number of machines embracing the patented improvement, from the assignee of an independent inventor thereof, and claimed the right, under the seventh section, to use the machines which it had actually in operation, notwithstanding the fact that the patentee was the first inventor. The circuit court charged the jury that the first clause of the seventh section did not confer such right upon the defendant, because there was no license or consent by the patentee, as inventor, to the use of the machines by the defendant. In considering that question, the court observed, in regard to the second clause of the seventh section, that it limited the right to apply for a patent to the period of two years after the inventor had sold his invention or allowed it to be used by others. But the second clause was not directly in judgment in the case. This observation on the subject appears to have been the origin of much that has been said on the question in subsequent cases, for this case of Pierson v. Screw Co. is generally cited as the leading authority in favor of the position taken by the appellants.

5

In Hovey v. Stevens, 1 Woodb. & M. 290, in the circuit court for the district of Massachusetts, in 1846, before Mr. Justice WOODBURY, a motion was made for a preliminary injunction, on a patent granted to Hovey. The question arose whether Stevens did not himself, before Hovey obtained his patent, discover or construct the patented invention. The court considered the question whether Stevens had not obtained a knowledge of Hovey's invention through a workman in his employ, who had previously been in the employ of Hovey and had used the improvement, and whether Stevens did not copy the improvement from Hovey's, without Hovey's consent, and before Hovey made his machine public or sold it. The court observed that in such a case the use of the machine by Stevens, though begun before Hovey obtained his patent, would be a use by fraud, not contemplated and saved under the seventh section of the act of 1839. The question was solely as to the right of Stevens to continue to use the machine which he had so begun to use before Hovey obtained his patent. The court declined to determine the question of fact involved, as an action at law to be tried by a jury for a violation of the patent between the same parties was then pending, and refused to grant the injunction. As appears by the report of the case of Hovey v. Stevens, 3 Woodb. & M. 17, 32, the bill in equity was dismissed, and the jury case was tried, and the plaintiff was nonsuited upon grounds not involving those considered on the motion for the preliminary injunction.

6

The next case cited is Pitts v. Hall, 2 Blatchf. 229, in 1851, in the circuit court for the Northern district of New York, before Mr. Justice NELSON and Judge CONKLING. In that case the only questions were, whether the patentee had forfeited his right to his invention by using it in public more than two years prior to his application, or whether such use by him was only experimental, with a view to further improvements; and also whether he had dedicated or abandoned his invention to the public use. The case in no manner involved the question before us.

7

In McCormick v. Seymo r, 2 Blatchf. 240, in 1851, in the circuit court for the Northern district of New York, before Mr. Justice NELSON, the points involved related wholly to the acts of the patentee himself, more than two years prior to his application, in respect to his own use in public of the patented improvement, and to the question of his abandonment of the invention to the public within the two years. The jury having failed to agree upon a verdict, the case was again tried, and resulted in a verdict and judgment for the plaintiff, thus overruling the defenses set up. At December term, 1853, this court reversed the judgment on the question of damages, but it approved the rulings below on the above points. Seymour v. McCormick, 16 How. 480.

8

The case of Sargent v. Seagrave, 2 Curt. 553, in 1855, in the circuit court for the district of Massachusetts, before Mr. Justice CURTIS, involved only the questions, on a motion for a preliminary injunction, of the exclusive possession of the right by the patentee, and the acquiescence of the public therein, after the issue of the patent, for the period of about two years, and its acquiescence in the claim of the patentee to a right under a caveat, for about two years before the date of the patent.

9

Then came the case of Kendall v. Winsor, 21 How. 322, decided by this court at December term, 1858. It was a writ of error to the circuit court for the district of Rhode Island, where the case was tried before Mr. Justice CURTIS and a jury. The suit was an action at law for damages for the infringement of a patent granted to Winsor, who had a verdict and a judgment. The particular question in the case arose wholly under the first clause of the seventh section of the act of 1839. The defendants claimed a right to use certain specific machines under that clause. The application for the patent was made in November, 1854. Prior to that time, the defendants had constructed one machine containing the patented invention, and they constructed others in the autumn of 1854. In the course of that fall, Winsor had knowledge that the defendants had built, or were building, one or more machines like his invention, and did not interpose to prevent them. Winsor had completed in 1849 four machines containing the patented improvements, and had made on them articles which he had sold. But he kept the machines from the view of the public, allowed none of the hands employed by him to introduce persons to view them, and the hands pledged themselves not to divulge the invention. Among those hands was one Aldridge, who left the plaintiff's employment in the autumn of 1852, and entered into an arrangement with the defendants to copy the plaintiff's machine for them, and did so, and the defendants' machines were built and put in operation by Aldridge, and under his superintendence, and by means of the knowledge which he had gained while in the plaintiff's employment, under a pledge of secrecy. On the basis of these facts, the defendants' counsel prayed the court to instruct the jury that, under the seventh section of the act of 1839, if the jury were satisfied that the machines for the use of which the defendants were sued were constructed and put in operation before the plaintiff applied for his patent, then the defendants possessed the right to use, and vend to others to be used, the specific machines made or purchased by them, without liability therefor to the plaintiff. The court did not grant this prayer, but instructed the jury that if Aldridge, under a pledge of secrecy, obtained knowledge of the plaintiff's machine, and thereupon, at the instigation of the defendants, and with a knowledge on their part of the surreptitiousness of his acts, constructed machines for the defendants, they would not have the right to continue to use the same after the date of the plaintiff's patent; but that, if the defendants had the machines constructed before the plaintiff applied for his patent, under the belief, authorized by him, that e consented and allowed them so to do, they might lawfully continue to use the same after the date of the patent, and the plaintiff could not recover. It was on this state of the case that the question came before this court. The first clause of the seventh section was the only one involved in the instruction asked for and in that above recited as given. This court affirmed the judgment and the propriety of the action of the circuit court. In its opinion it observed that inventors were 'entitled to protection against frauds or wrongs practiced to pirate from them the results of thought and labor;' that 'the shield of this protection has been constantly interposed between the inventor and fraudulent spoliator by the courts of England, and most signally and effectually has this been done by this court, as is seen in the cases of Pennock v. Dialogue, 2 Pet. 1, and of Shaw v. Cooper, 7 Pet. 292.' The opinion of the court treated the case as one in which the rights of Winsor could not be affected, because the knowledge of the invention had been surreptitiously obtained and communicated to the public; and went on to remark that the instruction to the jury at circuit was in strict conformity with that principle, and with the doctrines declared in Pennock v. Dialogue and Shaw v. Cooper. It closed the opinion by saying: 'That instruction diminishes or excludes no proper ground upon which the conduct and intent of the plaintiff below, as evinced either by declarations or acts, or by omission to speak or act, and on which also the justice and integrity of the conduct of the defendants, were to be examined and determined. It submitted the conduct and intentions of both plaintiff and defendants to the jury, as questions of fact to be decided by them, guided simply by such rules of law as had been settled with reference to issues like the one before them; and upon those questions of fact the jury have responded in favor of the plaintiff below, the defendant in error. We think that the rejection by the court of the prayers offered by the defendants at the trial was warranted by the character of those prayers, as having a tendency to narrow the inquiry by the jury to an imperfect and partial view of the case, and to divert their minds from a full comprehension of the merits of the controversy.' It is thus seen that this case not only turned upon a right claimed wholly under the first clause of the seventh section, but that it was held that a fraudulent, piratical, and surreptitious purchase or construction of a machine, like that shown in that case, was not such a purchase or construction as was covered by the first clause of the seventh section. The decision in that case does not affect the one now before the court. It may well be that a fraudulent, surreptitious, and piratical purchase or construction or use of an invention prior to the application for the patent would not affect the rights of the patentee under either clause of the seventh section; but the present is not such a case as that which existed in Kendall v. Winsor. In the use of driven wells in public, at Cortland, by others than Green, more than two years before his application, we see nothing in the evidence under which such use can properly be characterized as fraudulent, piratical, or surreptitious. Green's invention was made in 1861. The brief of the appellants at the former hearing contained this statement: 'But it is not denied that in this case there is proof that after the invention by Green in 1861, and his public exhibition of it in Cortland, the rumor of it spread, and the value of it became apparent, and other persons, without Green's consent and allowance, did put the invention into public use without his knowledge.' The application for the patent was made March 17, 1866. It is true that the driven wells thus referred to were constructed, some by Mudge and some by Suggett, who obtained knowledge of the invention from Green. It is admitted in the a pellants' brief on the present application that, subsequently to Green's invention, and more than two years prior to his application, Suggett put down four driven wells, for persons named Copeland, Seaman, Foster, and Samson respectively, and Mudge, five wells, for persons named Pomeroy, Bolles, Bates, Seaman, and Hicks respectively. But there is nothing that indicates in regard to these wells fraud or piracy or surreptitiousness, in the sense of the decision in Kendall v. Winsor. The invention was made by Green and publicly exhibited, the rumor of it spread and its value became apparent, and the persons for whom the wells so put down were made had them constructed during the time when, for five years after the invention, Green failed to apply for a patent. Of course, Green, from the moment of the invention, had an inchoate property therein, which he could complete by taking a patent. The first clause of the seventh section of the act of 1839 gave to the persons for whom those wells were constructed a right to use them without the consent of Green, and the second clause of that section had the effect to make Green's patent invalid because of the use of the invention by those persons more than two years before he applied for his patent.

10

In the case of Sanders v. Logan, 2 Fish. Pat. Cas. 167, in 1861, in the circuit court for the Western district of Pennsylvania, before Mr. Justice GRIER and Judge MCCANDLESS, the bill was dismissed because the patentee had abandoned his invention, and because it had been publicly used, with his knowledge, consent, and approbation, more than two years prior to the application for the patent.

11

In the case of Hide Co. v. Tool Co., 4 Fish. Pat. Cas. 284, in 1870, in the circuit court for the district of Massachusetts, before Judge SHEPLEY, the question tried was, whether the invention was in public use or on sale, with the knowledge and consent of the inventor, more than two years before he applied for his patent, and whether he had abandoned his invention to the public prior to his application. On these issues the jury found for the defendants.

12

In McMillin v. Barclay, 5 Fish. Pat. Cas. 189, in 1871, in the circuit court for the Western district of Pennsylvania, before Judge MCKENNAN, two patents were involved. In regard to one of them the defense was that the patentee had himself used the invention in public more than two years before he applied for his patent. It was held that, when it was so used, it was a complete invention, and the patent was held to be invalid. In regard to the other patent, the defense was that of abandonment by the patentee subsequently to the making of his application, the application having been made in 1855, and the patent having been granted in 1867, and the invention having gone into use subsequently to the application. The defense of the abandonment of the invention after the application was filed was overruled.

13

In Russell & Erwin Co. v. Mallory, 10 Blatchf. 140, in 1872, in the circuit court for the district of Connecticut, before Judges WOODRUFF and SHIPMAN, the question involved related entirely to an abandonment of the invention and to the effect of the acts of the patentee within two years prior to the application.

14

In Jones v. Sewall, 3 Cliff. 563, in 1873, in the circuit court for the district of Massachusetts, before Mr. Justice CLIFFORD, it was set up as a defense that the several improvements covered by the patent sued on were in public use and on sale more than two years before the patentee made his application for the patent. The court overruled the defense, holding that there was no evidence to show that the inventions, or either of them, were in public use or on sale more than two years before the inventor applied for a patent, or for any shorter period, with his consent and allowance, or that he had any knowledge of any such sale or public use at the time it was made; and that, on the contrary, the evidence showed that he never gave his conse t to any such sales, and that he constantly asserted that he intended to apply for a patent. The decision was placed upon the ground, that such consent and allowance were necessary to the invalidity of the patent. This was a direct adjudication upon the point involved in the present case.

15

In Klein v. Russell, 19 Wall. 433, at October term, 1873, the defense was want of novelty. The plaintiff had a judgment, which was affirmed by this court. At the trial, the defendant requested the court to charge the jury: '(1) That the invention, as described in the patent of February, 1870, is the treatment of bark-tanned sheep and lamb skins by the employment of fat liquor, and if such treatment was known to others and more than two years before the plaintiff applied for his patent, his patent is void.' He also requested the court to instruct the jury: '(7) That if fat liquor had been used substantially in the manner specified in the plaintiff's patent, for the purpose of rendering any kind of leather soft and supple, more than two years before the plaintiff applied for a patent, the plaintiff cannot recover, even though it had not been so used in dressing bark-tanned lamb or sheep skins.' These instructions were refused, and the failure to give them was alleged as error. The defendant in error contended, in this court, that the first request did not correctly or fully describe the invention; that the employment of fat liquor merely was not the whole of the invention, but that it was the employment of fat liquor in the condition and manner described in the specification; and that the refusal to charge the seventh request was proper. In regard to the first request, this court said that the instruction was properly refused, and that it stated inaccurately the rule of law which it involved. The court added: 'A patent relates back, where the question of novelty is in issue, to the date of the invention, and not to the time of the application for its issue. The jury had already been sufficiently instructed upon the subject. The instruction assumes that the reissue was for the use of fat liquor, without reference to the point whether it were hot or cold.' The court then proceeded to hold that the two claims of the patent sued on required that the fat liquor should be heated, and that, therefore, the first instruction asked was improper. It is quite apparent that the court considered only the issue of novelty, and that it did not pass upon the question involved in the present case. The seventh request, like the first, was inaccurate, because it referred to the time of the application, and not to the date of the invention; and, in regard to the seventh request, the court merely said that it was satisfied with the rulings of the court below in regard to that request and four others which, it stated, might be 'grouped and disposed of together;' and it added that neither of them required any special remark. We cannot regard the case of Klein v. Russell as adjudicating the question now presented.

16

In Henry v. Francestown Co., 2 Ban. & A. 221, in 1876, in the circuit court for the district of New Hampshire, before Judge SHEPLEY, the defense was the public use and sale of the invention by the patentee more than two years before he applied for his patent. It was held that the use and sales by him were experimental.

17

In Jar Co. v. Wright, 94 U. S. 92, at October term, 1876, a patent granted in 1870, on an application made in January, 1868, the invention having been completed in June, 1859, was held void, because (1) there was a purchase, sale, and prior use of the invention more than two years before the application; and (2) at the time of the application the invention had been abandoned to the public. The sale and prior use were by the inventor himself. This case does not adjudge the point here involved.

18

In Kelleher v. Darling, 4 Cliff. 424, in 1878, in the circuit court for the district of Massachusetts, before Mr. Justice CLIFFO D, the original patent was issued in 1871, under the act of July 8, 1870, and was divided, on its subsequent surrender, into two reissued patents. No question arose in the case under the act of 1839. So, too, the case of Henry v. Tool Co., 3 Ban. & A., 501, in 1878, in the circuit court for the district of Rhode Island, before Mr. Justice CLIFFORD, arose under the act of 1870.

19

In Draper v. Wattles, 3 Ban. & A. 618, in 1878, in the circuit court for the district of Massachusetts, before Judge LOWELL, the original patent was issued in 1869, on an application made in June, 1868. The court held that, under the seventh section of the act of 1839, the sale or use more than two years prior to the application must have been with the consent or allowance of the inventor, in order to invalidate the patent, and that the patent was not invalidated by the sale by the inventor more than two years before he applied for his patent of an article which did not embody the whole of his invention as subsequently patented. The point involved in the present case was thus directly adjudged.

20

In Bates v. Coe, 98 U. S. 31, at October term, 1878, the original patent was issued in 1863. Mr. Justice CLIFFORD, in delivering the opinion of the court, stated that the answer did not set up as a defense that the invention had been in public use or on sale in this country for more than two years before the application for the patent, and that there was nothing in the record to support that proposition, if it had been well pleaded. His ovservation, therefore, citing Pierson v. Screw Co., 3 Story, 402, that, under the seventh section of the act of 1839, the public use or sale, in order to defeat the right of the inventor to the patent, must have been with his consent and allowance for more than two years prior to the application, was an observation made in regard to a point not in issue or in judgment.

21

In Henry v. Francestown Co., 5 Ban. & A. 108, in the circuit court for the district of New Hampshire, in 1880, before Judge LOWELL, the patent had been granted in 1859, on an application filed in 1857. On proof that the inventor had, more than two years prior to his application, sold articles containing his invention, not experimentally, the patent was held invalid.

22

In Graham v. McCormick, 10 Biss. 39, 11 Fed. Rep. 859, and 5 Ban. & A. 247, in the circuit court for the Northern district of Illinois, in 1880, before Judge DRUMMOND, the patent having been granted in 1868, the question was as to a use or sale by the inventor more than two years before his application; and it was held that, as a matter of fact, the sale and use by him were experimental.

23

In Brickill v. Mayor, etc., 18 Blatchf. 273, 7 Fed. Rep. 479, in 1880, in the circuit court for the Southern district of New York, before Judge WHEELER, the patent had been granted in 1868, and the defendant, the city of New York, set up a right to use the invention, which was for the combination of a heating apparatus with a steam fire engine, by reason of the fact that the patentee had made it while in the employ of the fire department of the city, and had attached it to two of the city fire engines. The court held, notwithstanding the construction put upon the first clause of section 7 of the act of 1839 by this court in McClurg v. Kingsland, 1 How. 202, that the defendants had acquired no right beyond the right to use the specific machines constructed prior to the application for the patent.

24

In Campbell v. Mayor, etc., 20 Blatchf. 67, 9 Fed. Rep. 500, in 1881, in the circuit court for the Southern district of New York, before Judge WHEELER, the patent having been granted in 1864, and the invention having been made, sold, and used by others than the patentee after he had invented it, and more than two years before he applied for his patent, but without his consent and allowance, it was held by the court that, under the second clause of the seventh section of the act of 1839, the public use and sale having been without the consent or allowance of the inventor, the patent was not invalid. This was a direct adjudication upon the point involved in the present case.

25

In Davis v. Fredericks, 21 Blatchf. 556, 19 Fed. Rep. 99, in 1884, in the circuit court for the Southern district of New York, before Judge WHEELER, the patent having been granted in 1868, the invention had got into public use and on sale more than two years prior to the application for the patent, but without the inventor's consent or allowance. The court held, following Campbell v. Mayor, etc., that the patent was not invalid, thus adjudging the point in question here.

26

Reference is also made, in the brief for the appellants, to 12 cases reported in 1 MacArth. Pat. Cas. running from 1841 to 1859, decided by the judges of the circuit and supreme courts of the District of Columbia, on appeals from the commissioner of patents; but in none of them was the point here involved in judgment. In Heath v. Hildreth (p. 12) no question arose under the act of 1839. In Arnold v. Bishop (p. 27) consent by the applicant to the use of his invention for more than two years prior to his application was shown. In Hunt v. Howe (p. 366) the sale was made by the inventor. In Rugg v. Haines (p. 420) the use and sale were with the consent and allowance of the applicant. In Mowry v. Barber (p. 563) the making and selling were by the applicant. In Carroll v. Gambrill (p. 581) the applicant was defeated upon the ground of estoppel and of abandonment of the invention. In Ellithorp v. Robertson (p. 585) he was defeated upon the ground of laches on his part, amounting to abandonment. In Blackinton v. Douglass (p. 622) there was public use with the consent of the inventor. This was also the case in Justice v. Jones (p. 635.) In Wickersham v. Singer (p. 645) there were abandonment by the inventor and consent and allowance by him. In Savary v. Lauth (p. 691) the applicants were defeated on the ground of laches by them and presumed acquiescence. In Spear v. Belson (p. 699) it was held that laches and delay on the part of the applicant had caused a forfeiture of his right.

27

The review we have given of the cases now cited on behalf of the appellants shows no adjudication by this court on the question involved, and a direct adjudication as to the effect of the second clause of the seventh section of the act of 1839, in accordance with that contended for by the appellants, in only four cases in circuit courts, (not including Andrews v. Carman.) To the contrary effect is the case of Egbert v. Lippmann, 15 Blatchf. 295, commented on in the former opinion, (123 U. S. 270, 271, 8 Sup. Ct. Rep. 103.)

28

It is alleged by the appellants that this court was in error in stating, as it did in its former opinion, (123 U. S. 269, 8 Sup. Ct. Rep. 102,) that, in Andrews v. Carman, 13 Blatchf. 307, 324, the question of the use of Green's invention by others more than two years prior to his application does not appear to have been raised; that it was in fact raised; and that the inference to the contrary grows out of a clerical error in the published opinion in Andrews v. Carman. It may be accepted that this is so, but the question of law involved is the very question now under consideration. It is also alleged that the same question was distinctly raised, in proof and argument, in the interference case between Green and Suggett respecting this invention, and that Green's patent was thereafter granted, with the understanding in the patent office that the Cortland wells now in question had been constructed subsequently to Green's invention and more than two years before his application. But patents are often granted with a view to leaving open, to be decided by the courts, questions which the patent office does not deem it proper to adjudicate against the applicant by withholding the patent. It is also urged that in the rules of the patent office, promulgated between the time of the passage of the act of March 3, 1839, and the enactment of the act of July 8, 1870, it was made known to applicants for patents that a patent would not be granted if the invention had been in public use or on sale, with the consent and allowance of the inventor, for more than two years before his application. It was undoubtedly true that such a state of facts was sufficient ground for withholding a patent; but the promulgation and enforcement of such a rule cannot be regarded as having the effect of a judicial or authoritative adjudication of the question under consideration. The argument sought to be founded upon the various phases assumed by the provisions of the act of July 8, 1870, in its passage through the two houses of congress, is very unsafe and unreliable, as a basis of judicial action, particularly when the only inference sought to be drawn is one as to what view congress took of the act of 1839, in enacting the act of 1870. If any inference is to be drawn on the subject, it can only properly be drawn from the act of 1870 as it stands on the statute book, and that inference is commented on in the former opinion of this court, at page 275 of 123 U. S., 8 Sup. Ct. Rep. 104, 105. The doctrine invoked by the appellants, that where the meaning of a statute has been settled by judicial construction that construction becomes a part of the statute, is not applicable to the present case. A question arising in regard to the construction of a statute of the United States concerning patents for inventions cannot be regarded as judicially settled when it has not been so settled by the highest judicial authority which can pass upon the question. The earliest decision of a circuit court, directly adjudging the point here involved, was in 1873. This court has always had jurisdiction to review suits on patents to a specified extent, and that jurisdiction was extended by section 56 of the act of July 8, 1870, (16 St. 207,) to writs of error and appeals, in such suits, without regard to the sum or value in dispute. No question arising in any such case, reviewable by this court, can be regarded as finally settled, so as to establish the law, for like cases, until it has been determined by this court. This view of the matter has been applied by this court in analogous cases. Thus, in Wilson v. Bank, 17 Wall. 473, a decision was made as to the construction of sections 35 and 39 of the bankruptcy act of March 2, 1867, which, this court said in its opinion, was contrary to the view taken by 'a large number of the district judges, to whom the administration of the bankrupt law is more immediately confided.' So, too, in Ex parte Wilson, 114 U. S. 417, 5 Sup. Ct. Rep. 935, as to the proper construction of the constitutional provision that 'no person shall be held to answer for a capital or otherwise infamous crime, unless on a presentment or indictment of a grand jury,' and as to what criminal prosecutions required an indictment, and in what an information was allowable, this court said (page 425:) 'Within the last fifteen years, prosecutions by information have greatly increased, and the general current of opinion in the circuit and district courts has been to wards sustaining them for any crime, a conviction of which would not at common law have disqualified the convict to be a witness.' The court cited seven cases in the courts of the United States, besides the one before it, which had adopted such view; but that view was overruled, and a contrary one established. Nor is this a case for the application of the doctrine that, in cases of ambiguity, the practice adopted by an executive department of the government in interpreting and administering a statute is to be taken as some evidence of its proper construction. The question before us, as to the validity of a patent, by reason of pre-existing acts or omissions of the inventor, of the character f those involved in the present case, is not a question of executive administration, but is properly a judicial question. Although it may be a question which, to some extent, may come under the cognizance of the commissioner of patents, in granting a patent, yet, like all the questions passed upon by him in granting a patent, which are similar in character to the question here involved, his determination thereof, in granting a particular patent, has never been looked upon as concluding the determination of the courts in regard to those questions, respecting such particular patent, and a fortiori respecting other patents.

29

It is contended for the appellants that the claim of the Green patent is for a process, being for 'the process of constructing wells by driving or forcing an instrument into the ground until it is projected into the water, without removing the earth upward as it is in boring, substantially as herein described;' that the seventh section of the act of 1839 applies only to 'a machine, manufacture, or composition of matter;' and that, therefore, that section does not apply to the present case. In addition to the view to the contrary taken by this court in McClurg v. Kingsland, 1 How. 202, before commented on, it was held by this court in Beedle v. Bennett, 122 U. S. 71, 7 Sup. Ct. Rep. 1090, a suit on this very patent, that the patent covers the process of drawing water from the earth by means of a well driven in the manner described in the patent, and that the use of a well so constructed was, therefore, a continuing infringement, because every time water was drawn from it the patented process was necessarily used.

30

The most plausible argument presented on the part of the appellants is that, under sections 6, 7, and 15 of the act of July 4, 1836, a patent was invalid if the thing invented had been in public use or on sale, with the consent and allowance of the inventor, prior to his application for the patent; that section 7 of the act of 1839 was intended only to limit the effect on the validity of the patent of the acquisition of single specimens of the patented invention; that the interests of purchasers or constructors of such specific articles were the sole objects of that section; that the second clause of the section was intended only to provide that the patentee should hold his right against the general public unless there was proof of abandonment by him, or unless the purchase, sale, or prior use by or to individuals who had acquired such specific articles had been for more than two years prior to the application for the patent; that in this respect alone were the provisions of the act of 1836 intended to be modified; and that a defendant, in order to show the invalidity of a patent under section 7 of the act of 1839 must show that he claims exemption from liability to the patentee because he purchased or constructed a specific article covered by the patent prior to the application therefor, and must show that the invention was abandoned, or that the purchase, sale, or prior use, or construction of the specific article occurred more than two years before the application for the patent, and with the consent and allowance of the inventor. But our views in regard to the proper construction of the seventh section do not admit the soundness of this contention, and were fully set forth in the former opinion. It is proper to notice the suggestion, that there is no declaration in the seventh section of the act of 1839 that either in the case of an abandonment of the invention or of the existence for more than two years prior to the application of the purchase, sale, or prior use referred to in the second clause of the section the patent shall be held to be invalid; and the further suggestion, that there is only an hypothetical implication that the patent shall be invalid in the excepted cases. But we cannot so interpret the statute. Under sections 6, 7, and 15 of the act of 1836, a patent was made invalid if, at he time of the application therefor, the invention had been in public use or on sale, with the consent or allowance of the patentee, however short the time. The second clause of the seventh section seems to us to clearly intend that where the purchase, sale, or prior use referred to in it has been for more than two years prior to the application the patent shall be held to be in valid, without regard to the consent or allowance of the inventor. Otherwise the statute cannot be given its full effect and meaning.

31

The result of these views is that the application for a rehearing is denied.